- EMDB-26061: Cryo-em structure of human prothrombinase on a nanodisc at 5.3 An... -
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Entry
Database: EMDB / ID: EMD-26061
Title
Cryo-em structure of human prothrombinase on a nanodisc at 5.3 Angstrom resolution
Map data
prothrombinase on a nanodisc
Sample
Complex: prothrombinase
Complex: Factor X light chain, Activated factor Xa heavy chain
Protein or peptide: Factor X light chain
Protein or peptide: Activated factor Xa heavy chain
Complex: Coagulation factor Va
Protein or peptide: Coagulation factor Va
Protein or peptide: Coagulation factor Va
Function / homology
Function and homology information
response to vitamin K / coagulation factor Xa / platelet alpha granule / Cargo concentration in the ER / Defective factor IX causes thrombophilia / Defective cofactor function of FVIIIa variant / Defective F9 variant does not activate FX / blood circulation / Extrinsic Pathway of Fibrin Clot Formation / COPII-mediated vesicle transport ...response to vitamin K / coagulation factor Xa / platelet alpha granule / Cargo concentration in the ER / Defective factor IX causes thrombophilia / Defective cofactor function of FVIIIa variant / Defective F9 variant does not activate FX / blood circulation / Extrinsic Pathway of Fibrin Clot Formation / COPII-mediated vesicle transport / positive regulation of leukocyte chemotaxis / COPII-coated ER to Golgi transport vesicle / positive regulation of TOR signaling / Gamma-carboxylation of protein precursors / Transport of gamma-carboxylated protein precursors from the endoplasmic reticulum to the Golgi apparatus / Common Pathway of Fibrin Clot Formation / Removal of aminoterminal propeptides from gamma-carboxylated proteins / Intrinsic Pathway of Fibrin Clot Formation / endoplasmic reticulum-Golgi intermediate compartment membrane / platelet alpha granule lumen / Post-translational protein phosphorylation / phospholipid binding / Golgi lumen / Regulation of Insulin-like Growth Factor (IGF) transport and uptake by Insulin-like Growth Factor Binding Proteins (IGFBPs) / blood coagulation / extracellular vesicle / Platelet degranulation / signaling receptor activity / positive regulation of cell migration / copper ion binding / endoplasmic reticulum lumen / external side of plasma membrane / serine-type endopeptidase activity / calcium ion binding / proteolysis / extracellular space / extracellular region / membrane / plasma membrane Similarity search - Function
Coagulation factor 5/8-like / Coagulation factors 5/8 type C domain (FA58C) signature 2. / Multicopper oxidases, conserved site / Multicopper oxidases signature 1. / Coagulation factors 5/8 type C domain (FA58C) signature 1. / Coagulation factor 5/8 C-terminal domain, discoidin domain / Coagulation factors 5/8 type C domain (FA58C) profile. / Peptidase S1A, coagulation factor VII/IX/X/C/Z / Coagulation factor-like, Gla domain superfamily / F5/8 type C domain ...Coagulation factor 5/8-like / Coagulation factors 5/8 type C domain (FA58C) signature 2. / Multicopper oxidases, conserved site / Multicopper oxidases signature 1. / Coagulation factors 5/8 type C domain (FA58C) signature 1. / Coagulation factor 5/8 C-terminal domain, discoidin domain / Coagulation factors 5/8 type C domain (FA58C) profile. / Peptidase S1A, coagulation factor VII/IX/X/C/Z / Coagulation factor-like, Gla domain superfamily / F5/8 type C domain / Coagulation factor 5/8 C-terminal domain / Coagulation Factor Xa inhibitory site / Multicopper oxidase, N-terminal / Multicopper oxidase / EGF-like domain / EGF-type aspartate/asparagine hydroxylation site / EGF-like calcium-binding, conserved site / Calcium-binding EGF-like domain signature. / Aspartic acid and asparagine hydroxylation site. / EGF-like calcium-binding domain / Calcium-binding EGF-like domain / Vitamin K-dependent carboxylation/gamma-carboxyglutamic (GLA) domain / Gamma-carboxyglutamic acid-rich (GLA) domain / Gamma-carboxyglutamic acid-rich (GLA) domain superfamily / Vitamin K-dependent carboxylation domain. / Gla domain profile. / Domain containing Gla (gamma-carboxyglutamate) residues. / Epidermal growth factor-like domain. / EGF-like domain profile. / EGF-like domain signature 2. / EGF-like domain signature 1. / EGF-like domain / Cupredoxin / Galactose-binding-like domain superfamily / Serine proteases, trypsin family, histidine active site / Serine proteases, trypsin family, serine active site / Peptidase S1A, chymotrypsin family / Serine proteases, trypsin family, histidine active site. / Serine proteases, trypsin domain profile. / Serine proteases, trypsin family, serine active site. / Trypsin-like serine protease / Serine proteases, trypsin domain / Trypsin / Peptidase S1, PA clan, chymotrypsin-like fold / Peptidase S1, PA clan Similarity search - Domain/homology
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)
United States
Citation
Journal: Blood / Year: 2022 Title: Cryo-EM structure of the prothrombin-prothrombinase complex. Authors: Eliza A Ruben / Brock Summers / Michael J Rau / James A J Fitzpatrick / Enrico Di Cera / Abstract: The intrinsic and extrinsic pathways of the coagulation cascade converge to a common step where the prothrombinase complex, comprising the enzyme factor Xa (fXa), the cofactor fVa, Ca2+ and ...The intrinsic and extrinsic pathways of the coagulation cascade converge to a common step where the prothrombinase complex, comprising the enzyme factor Xa (fXa), the cofactor fVa, Ca2+ and phospholipids, activates the zymogen prothrombin to the protease thrombin. The reaction entails cleavage at 2 sites, R271 and R320, generating the intermediates prethrombin 2 and meizothrombin, respectively. The molecular basis of these interactions that are central to hemostasis remains elusive. We solved 2 cryogenic electron microscopy (cryo-EM) structures of the fVa-fXa complex, 1 free on nanodiscs at 5.3-Å resolution and the other bound to prothrombin at near atomic 4.1-Å resolution. In the prothrombin-fVa-fXa complex, the Gla domains of fXa and prothrombin align on a plane with the C1 and C2 domains of fVa for interaction with membranes. Prothrombin and fXa emerge from this plane in curved conformations that bring their protease domains in contact with each other against the A2 domain of fVa. The 672ESTVMATRKMHDRLEPEDEE691 segment of the A2 domain closes on the protease domain of fXa like a lid to fix orientation of the active site. The 696YDYQNRL702 segment binds to prothrombin and establishes the pathway of activation by sequestering R271 against D697 and directing R320 toward the active site of fXa. The cryo-EM structure provides a molecular view of prothrombin activation along the meizothrombin pathway and suggests a mechanism for cleavage at the alternative R271 site. The findings advance our basic knowledge of a key step of coagulation and bear broad relevance to other interactions in the blood.
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